Stop in for a cup of coffee

Good reference

Understanding Production Date Codes​

• By Moparr Motor - Detroit (Nov 1992, Dec 2004, Dec 2010)
• The following information can be used as your guide to better understand the date codes that are applied to components used in the production of vehicles. There are various types of date code identification applied to material.
• Production dates could be etched, stamped (ink or steel punch type) on the part or even on a tag. Keep in mind that this is just a guide. Chrysler has a scheme that was to be followed however, some suppliers applied the code slightly different. Some codes are easy to spot and translate and some require a considerable examination.
• Typically the scheduled vehicle production would be from August 1st to July 31st.
• 
  

  Ref	Date code type	Code meaning	Example	Components typically found with this type of date identification
  A	Alpha-numeric 2 digit code	Month & Year	E9 = May 1969	Carter carburetor base, Carter Fuel pump, Viscous fan drives, drive shafts
  B	Single digit	Year	G = 1971	Engine identification pad
  C1	Two digit	Month & Year	71= 7th month (July) 1971 or A 0 = January 1970	Side view mirrors, glass, wheels, temperature sending units. Prestolight ignition distributor ID tag, oil pressure-sending unit.
  C2	Two digit	Year (Calendar)	70 = 1970	Alternator and starter
  C3	Two digit	Month & Day	12 6 = December 6th	Wheels . The part number would give you an idea of the year.
  C4	Two digits with dots	Year & Month	7. . . = 1967 March 9. . = 1969 February	Motor mount
  D1	Three digit	Production week & Year	301 = 30th week of 1971	Exhaust manifolds, seat tracks, fuel sending units, ignition coils, voltage regulators, ignition distributor tags, lower control arms horns
  D2	Three digit	Month, Day & Year	12 6 71 = December 6, 1971	U joint strap, alternator, engine block
  D3	Three digit	Month, Day & Year	12 6 1 = December 6, 1971	U joint strap, alternator, engine block
  D4	Three digit	Production week & year	241= 41st week of 1971	U joint strap, alternator, engine block, torsion bars, belts
  E1	Four digit	Day of year & Year	3301 = 330th day of 1971	K frame, master cylinder, power steering gear, windshield wiper motor, Holley carb, Carter carb ID tag, hoses, Radiator, Hood catch , hood latch, emergency brake mechanism
  E2	Four digit	Day, Month & Year	10 9 69 = October 9, 1969	Dana axle tubes, exhaust manifolds, water pump
  E3	Four digit	10,000 Day calendar	2995 = Oct 9, 1969	Hemi engines, manual and automatic transmissions
  F	Five digit	Year & Quarter	1971 1 = 1st quarter of 1971	Spark plug wires
  G	Cast Star wheel (12)	Year & month	*	Alternator starter
  H	Cast boxes (12)	Year & month	*	Automatic transmission tail shaft

  
  
• * = Casting date. The spokes or boxes that have dots in them represent the month that the component was cast. Dots in 5 spokes or boxes = May, Dots in 10 spokes or boxes = October.

The Month Numerals Are As Follows​

• 
  

  1	January	7	July
  2	February	8	August
  3	March	9	September
  4	April	10	October
  5	May	11	November
  6	June	12	December

The Month Letters Are As Follows​

• 
  

  A	January	G	July
  B	February	H	August
  C	March	J	September
  D	April	K	October
  E	May	L	November
  F	June	M	December